Thanks for sharing the Fusion 360 file, nice work!
I changed the Fusion 360 file (Modify -> Change parameters) to accommodate 7/16 wooden dowels (11.2mm). I used an M3 bolt instead of an M6 bolt. I also lengthened the top support from 135mm to 180mm.
Next step: I've remixed (cut & combined) the central portion to eliminate the two short dowels and the M6 bolt, will post after it prints.